Page 



Figiire 6. 14 Geothermal gradient recorder in pressure case. 45 



Figure 6. 15 Straightening probe, geothermal gradient 



recorder 45 



Figure 6. 16 Scripps Institution of Oceanography current 



meter 46 



Figure 6. 17 Chassis -- Scripps Institution of Oceanography 



current meter 46 



Figure 6. 18 Deck readout, Scripps Institution of Oceano- 

 graphy current meter 47 



Figure 6. 19 Depth readout meter, Scripps Institution of 



Oceanography current meter 47 



Figure 6. 20 X-Y plot current, Scripps Institution of 



Oceanography current meter 49 



Figure 6. 21 Circuit boards fronn binary switching module. . 50 



Figure 6. 22 Electrical noise in the sea, azimuthal 



variation 50 



Figure 6. 23 Irradiance as function of wave length and depth. 51 



Figure 7. 1 Computer facilities. National Oceanographic 



Data Center 59 



Figure 8.1 U.S. bathymetric holdings (1961) 69 



Figure 8.2 U.S. bathythermograph holdings 70 



Figure 8.3 Research ship 72 



Figure 8.4 Oceanographic survey instruments required. . • 73 



Figure 8.5 Specifications for the three instrument suits. . . 75 



Figure 8. 6 Submarine instrument suit 77 



XX 



